Stuff-meter.



E. J. TRIMBEY.

I STUFF METER.

APPLICATION FILED DEC. 5. 1914.

P Patented Nov. 23, 1915.

- Be it known that I,

EDWARD JAMES TBIIVIBEY, OF WINDSOR, QUEBEC, CANADA.

STUFF-METER.

eme.

Specification of Letters Patent.

Patented Nov. 23,1915.

Application filed December 5, 1914. Serial No. 875,720.

In the present state of the art of paper making there is no rapid methodof determining the per cent. consistency of wet pulp as it is pumped tothe heaters or to the mixing tanks, or of wet paper stock as it ispumped to the head-box of the Jordan engine or as it is pumped to thehead-box of the paper machine, the Jordan engine being a machine forfurther refining the fibersaftr having passed through the heaters andbefore going to the paper machine.

The term per cent. consistency as used in this specification means thenumber of parts of bone-dry matter in one hundred parts of wet pulp orofwet paper stock.

The object of myinvention is to afford a convenient and rapid method ofascertaining, by ii1spection,- the per cent. consistency of 'Wet pulp orof wet-paper stock containing from three parts to five parts of bone-drymatter per one hundred parts of wet pulp or of wet paper stock as thesame is being pumped for use in the manufacture of paper, or, forindicating the amount of water which must be added to a given mass ofsuch wet pulp or of such wet paper stock to dilute same to apredetermined lower per cent. consistency, for the purpose of moreclosely regulating the proportions of the Various kinds of pulp used,and, by maintaining a more nearly uniform per cent. consistency of thewet paper stock supplied to the paper machine to facilitate theobtaining of an approximately uniform weight per ream of the paper made.

To accomplish my object I employ two chambers, one, to which a portion"of the wet pulp or the wet paper stock the per cent. consistency ofwhich is to be determined, is conducted, is provided with an overflowdam for maintaining a constant level and therefore a constanthead on anunalterable orifice cut in a plate of thin metal which is placed in thebottom of this chamber and the discharge from which area.

charge orifice from same.

-ber.

passes into the other chamber; this second chamber communicates at thebottom with an approximately "horizontal unalterable spout of suitablelength and cross-sectional The rate of flow into this second chamber isa definite amount being controlled by the constant head inthe firstchamber and the size of the unalterable dis- The head in the secondchamber is largely controlled by the frictional resistance opposing theflow of the wet pulp or the wet paper stock in the unalterable spoutcommunicating therewith, and as this-frictional resistance varies withthe per cent. consistency of the wet pulp or of the wet paper stock,either the per cent. consistency or the amount of Water to be by theheight to which the level of the wet pulp or wet paper stock rises inthis cham- The height is shown by means of a float supported upon thesurface of the wet 'pulp or wet paper stock; this float carries apointer moving in front of a scale whose graduations are determined byactual tests,

for the grade of wet pulp or of wet paper stock passing through thestuff meter. That the float may not become spattered or covered by theincoming wet pulp or wet paper stock it is protected by means of anadadded for the desired dilution, is indicated justable baffie, which isso adjusted that it ,will project but a short distance beneath thesurface, so as to guard against the formation of a stratum of a high percent. consistency which would gradually be formed if. the baflieprojected for any considerable distance beneath the surface and whichwould bind against the sides of the chamber and interfere with the. free-movement of the surface level of the wet pulp or wet paper stock andthus with the movement of the float.

be to have the wet pulp or the Wet paper ,stock in the supply chests ata somewhat When usingthis apparatus the aim would V pointer so guided asto pass in front of a graduated scale, should show the depth or head ofwet pulp or of wet paper stock in a chamber communicating at the bottomwith her 1 through the an approximately horizontal unalterable spoutwhen the rate of fiow into-this chamber and through this spout is theamount determined by the discharge through an unalterable orifice in aplate of thin-metal under the influence of a constant pressure, thisconstant pressure being maintained by means of anoverfiow dam of a givenheight in a separate chamber in the bottom of which is located theun'alterable orifice. It is alsoessential that the chamber communieatingat the bottom with the unalterable spout should be provided with abaflie which can be vertically adjusted, that the plane of this battleshould be approximately perpendicular to the axis of the spout, and thatthe wet pulp or the wet paper stock should enter the chamber at the ,topand on the side of the baffle opposite to that at which communication ishad with the spout.

As it is the general practice to use a headbox in which a constant levelis maintained for regulating the supply to the Jordan engines or to thepaper machines the unalterable orifice can be located in the bottom ofthe regular headsbox in such cases. The unalterable spout is preferablyprovided with a contracted outlet end to resemble a nozzle, though thisfeature is not essential; this spout may either be straight, as shown inthe accompanying drawings, or be bent if found more convenient.

One construction of my apparatus is shown by the accompanying drawingsin which*- Figure 1 is a sectional elevation on the both views.

A portion of the wet pulp or of the wet paper stock, the per cent.consistency of which is to be determined, enters the champipe 2 andflows into one compartment 10 of the chamber '5 through the unalterableorifice 3 in the thin plate of metal 4; the excess not passing throughthe orifice 3 flows over the partition or dam 6 and passes back to thesupply chest through the pipe 7. The upper part of the chamber 5 isdivided into two compartments 10 and 11 by the movable partition 8 whichis adjustable vertically and is restrained from sidewise movement by thegrooves 9. In the compartment 11, protected from the I spattering, andthe agitation of the surface caused by the incoming wet pulp or wetpaper stock, by the movable partition 8 is the float 12 to which isattached the stem 13 carrying the pointer 14 which passes in frontaaemea of the graduated scales 15 as the surface level changes and thefloat 12 rises and falls in response thereto. The stem 13 is guided andrestrained from sidewise movement by the guides 16 which are attached tothe body of the chamber 5, and which also support the graduated scales15. After passing through the chamber 5 the wet pulp or the wet paperstock passes through the unalterable spout 17 and is discharged throughthe contracted end 18 of this spout and is conducted back to the supplychest by the pipe 20, having a suitable inlet 19 and discharging intothe pipe 21, into which the pipe 7 also discharges. From the supplychest 22, the pulp or paper stock is circulated through the main supplypipe 23 by means of the pump 24.,'a portion of the pulp .-or paper stockbeing discharged through the branch pipe 2 into the chamber 1. Theregulable water supply pipe is indicated at I do not wish to restrictmyself to this specific construction of the stuff meter, but what Iclaim as my im'ention is,

1. A stuff meter for wet pulp and wet paper stock, comprising a constantlevel chamber having a discharge orifice maintained under a constanthead of the pulp or paper stock, a variable level chamber arranged toreceive the pulp or paper stock discharged from said orifice andprovided with an outlet of suitable size and proportion to cause africtional resistance to the flow of the pulp or paper stocktherethrough, and thereby maintain a head of the pulp or paper stockwithin the chamber varying with its consistency and frictionalresistance, and means for indicating variations in the head of the pulpor paper stock in said chamber; substantially as described.

2. A stufi meter for wet pulp and wet paper stock, comprising a constantlevel chamber having an overflow dam for maintaining a constant leveltherein and pro- "ided in its bottom with a discharge orifice in a thinplate of metal, and a variable level chamber arranged to receive thepulp or paper stock discharged under a constant head through saidorifice; substantially as described.

3. A stufl meter for wet pulp and wet paper stock, comprising a constantlevel chamber having a discharge orifice maintained under a constanthead of the pulp or paper stock, a variable level chamber arranged toreceive the pulp or paper stock discharged from said orifice andprovided with an outlet of suitable size and proportion to cause africtional resistance to the flow of'the pulp or paper stocktherethrough, and thereby maintain a head of the pulp or pa-perstockwithin the chamber varying with its consistency and frictionalresistance, said variable level chamber having an adjustable partitiontherein dividing the memes same into two compartments, in one of whichthe pulp or paper stock is received, a float within the other of saidcompartments arranged to be actuated by variations in the level of thepulp or paper stock, and a pointer carried by said float and cooperatingwith a suitable scale for indicating the consistency of the pulp orpaper stock; substantially a described.

4:- A stufi' meter for wet pulp and Wet paper stock, comprising aconstant level varying with its consistency and frictional resistance,said variable level chamber having an adjustable partition thereindividing the same into two compartments, in one of which the pulp orpaper stock is received, a float within the other of said compartmentsarranged to be actuated by variations in the level of the pulp or paperstock, and a pointer carried by said float and cooperating with asuitable scale for indicating the amount of water to be added to a givenmass of the pulp or paper stock to dilute the same to a predeterminedlower consistency; sub stantially as described.

5; A stuff meter for wet pulp and wet paper stock, comprising a constantlevel chamber having a' discharge orifice maintained under a constanthead of the pulp or paper stock, a variable level chamber arranged toreceive the pulp or paper stock discharged from said orifice andprovided with an out: let discharge pipe leading from the bottom thereofat one side, said discharge pipe being of suitable size and proportionto cause a frictional resistance to the flow of the pulp or paper-stocktherethrough, and thereby maintain a head of the pulp or paper stockwithin the chamber varying with its consistency and frictionalresistance, said variable level chamber having an adjustable partitiontherein dividing the same into two compartments, from one of which thedischarge pipe leads and into the other of which the pulp or paper stockis received, and a float in the former of said compartments,ar-'

ranged'to be protected from spattering of the inflowing pulp or paperstock by said partition; substantially as described.

6. A stuff meter for Wet pulp and wet paper stock, comprising a constantlevel chamber having a discharge orifice maintained under a constanthead of the pulp or paper stock, a variable level chamber arranged toreceive, at one side thereof, pulpor paper stock discharged from saidorifice, and provided with an outlet discharge pipe from thebottom'thereof at the other side of suitable size and proportion tocause a frictional resistance to the flow of the pulp or paper stocktherethrough, and thereby maintain a head of the pulp or paper stockwithin the chamber varying with its consistency and frictionalresistance, an adjustable partition in said chamber below which the pulpor paper stock must pass, and a float on the opposite side of saidpartition from the pulp or paper stock inlet, whereby the pulp or paperstock in said variable level chamber is kept in motion and continuallychanging; substantially as described.

EDWARD JAMES TRIMBEY. Witnesses:

ANGUS MQINTYRE, FRANK WILLIAM ANNANDALE.

